The powerbus gives you a dedicated 30 amp feed and 6 fused terminating points for any accessories you would hardwire into your electrical system, like a GPS, some communication systems (Autocom, Starcom, etc.), heated grips, additional power outlets, XM or Sirius radio, etc. The way the powerbus is connected to your electrical system, it is only energized when your key is turned on. That could be a benefit over wiring everything directly to an unswitched source (like the battery) as you wouldn't have to worry so much about an accessory left on and draining the battery down.